$r^{2}-8r+9$
$\left(7+18^1\right)$
$2sen\left(\frac{\pi}{3}+x\right)=-\sqrt{2}$
$\left(-5\right)-\left(-7\right)$
$5\cdot7\cdot8$
$4+w^2+5+w^2$
$9x^2+30x$
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